Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description adds behavioral detail beyond the annotations by documenting the structured error object that is returned on failure, including fields for error codes, HTTP status, and retry recommendations. This is genuinely helpful information for agents handling failures, and there is no contradiction with the annotation-driven hints.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is immediately front-loaded with the tool's core purpose, then provides the required key and failure contract in two sentences without redundancy. Every clause contributes useful information, and there is no fluff.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's simplicity, full schema coverage, and presence of an output schema, the description supplies the important pieces that are not present elsewhere: the API key requirements and the detailed error response structure. An AI agent does not have to guess about the failure mode or required keys.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the input schema already explains both api_key and alert_id completely, including alert_id provenance from create_price_alert or list_price_alerts. The description does not add meaningful parameter-level information beyond the schema, so the baseline of 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific action ('Get one price alert'), a specific resource ('price alert'), and the exact identifying parameter ('alert_id'). The word 'one' implicitly distinguishing from list_price_alerts and the clarity of scope make it a clear, purpose-defining statement.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives us context: you need an API key and an alert_id, so usage is implicitly scoped to retrieving a single alert by ID. However, no explicit guidance is given about when to prefer this vs alternatives like list_price_alerts to get multiple alerts or get an ID for this tool.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.